I do the same thing to, I am in the ergo scene more recently and my most recent pcb was gorgeous feature ridden but extremely expensive. I have made a few cheap boards a wireless dactyl for about 50 bucks with all my 3D printed parts, but I agree that keyboards get expensive and it can be really fun and challenging sometimes to see how cheap you can go. Me and my buddy actually just built a super easy cheap PCB for beginners to learn on, and even then we kept trying to keep ourselves from over pricing a cool cheap Keeb. We made a version that for about 60 you can fully build out if you were provided the tools (soldering iron, solder, flux) it was really fun pushing us through